ASC Stainless Steel 350 Legend magazines are engineered with the highest levels of quality and constructed with the most durable materials. These magazines are manufactured 100% start to finish in the USA using .032 gauge 410 Stainless Steel Alloy and heat treated for superior strength and lasting endurance. The magazine is chemically treated for corrosion resistance [ref QQ-P-35] integrated with ASC's proprietary coating, a high grade Marlube which is a wear-in not wear-off coating that burnishes in the surface providing self-lubricating properties. Features: 410 Series Stainless Steel Body, Heat Treated Chrome Silicon Spring Enhanced Anti-tilt Polymer Followers with PTFE 300 Series SS Floor plate with Black Oxide Coating for Corrosion Resistance